Effect of Cr Addition on Tribological Properties of Ni3Si Alloys

doi:10.11901/1005.3093.2017.176

Chinese Journal of Materials Research

2018, Vol. 32

Issue (5): 395-400 DOI: 10.11901/1005.3093.2017.176

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Effect of Cr Addition on Tribological Properties of Ni₃Si Alloys

Muye NIU^1,², Xinghua ZHANG^1,²(

), Haicheng ZHAO¹, Yu XIA¹, Jiajie LIU¹

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Muye NIU, Xinghua ZHANG, Haicheng ZHAO, Yu XIA, Jiajie LIU. Effect of Cr Addition on Tribological Properties of Ni₃Si Alloys. Chinese Journal of Materials Research, 2018, 32(5): 395-400.

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Abstract

Ni₃Si alloys were microalloyed via arc melting with small amounts of Cr and B for improving their mechanical properties. The microstructure, phase composition and tribological property of Ni₃Si alloys were investigated. Results show that Ni₃Si alloy was mainly composed of β₁-Ni₃Si and γ-Ni₃₁Si₁₂phases; with the increasing Cr-conten the phase composition was changed to γ-Ni₃₁Si₁₂ and α-Ni, and then changed to γ-Ni₃₁Si₁₂ and Cr₃Ni₅Si₂; the microhardness increased along with the increasing Cr-content; during the dry sliding friction the friction coefficients of the alloys were about 0.5 and their wear rates were much lower than that of 316 stainless steel. The optimum addition of Cr for the best tribological property of the Ni₃Si alloy was 5% Cr (in mass fraction). With the increasing load the wear mechanisms of Ni₃Si alloys with 0% and 5% Cr exhibited significant change from abrasive wear to adhesive wear. The wear mechanisms of the alloys with 10% Cr were all the fatigue wear within the range of the test load.

Key words: metallic materials intermetallic compounds arc melting microstructures tribological properties

Received: 07 March 2017

Fund: Supported by Natural Science Fund for Colleges and Universities in Jiangsu Province (No. 15KJB460007), National Natural Science Foundation of China (No. 51505199) and Natural Science Foundation of Jiangsu Province (No. BK20140511)

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	Muye NIU
	Xinghua ZHANG
	Haicheng ZHAO
	Yu XIA
	Jiajie LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.176 OR https://www.cjmr.org/EN/Y2018/V32/I5/395

Table 1 Chemical compositions of the powders

Fig.1 Surface morphology of Ni₃Si alloys (a) without Cr, 5%Cr (b) and (c) 10%Cr

Fig.2 X-ray diffraction patterns of Ni₃Si alloys

Fig.3 Microhardness of Ni₃Si alloys

Fig.4 Variation of the friction coefficients of Ni₃Si alloys and 316 stainless steel with applied load at sliding speed of 0.30 m/s

Fig.5 Variation of the wear rates of Ni₃Si alloys and 316 stainless steel with applied load at sliding speed of 0.30 m/s

Fig.6 SEM micrographs of the worn surface of Ni₃Si alloys at sliding speed of 0.30 m/s with applied load of 5 N (a) Ni₃Si, (b) 5% Cr and (c) 10% Cr

Fig.7 SEM micrographs of the worn surface of Ni₃Si alloys at sliding speed of 0.30 m/s with applied load of 10 N (a) Ni₃Si, (b) 5% Cr and (c) 10% Cr

Fig.8 SEM micrographs of the worn surface of Ni₃Si alloys at sliding speed of 0.30 m/s with applied load of 15 N (a) Ni₃Si, (b) 5% Cr and (c) 10% Cr

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